Americans for tooth decay and rampant lefthandedness. ;)
Some might argue that Americans (and the politicians we elect) are more responsible for the problems you cited than are immigrants. I suppose it's easier to blame "others". That way it's not our own fault.
BTW, America's unions have apparently left you behind.
http://www.nytimes.com/2009/04/14/us/14immig.html?th&emc=th"The nation’s two major labor federations have agreed for the first time to join forces to support an overhaul of the immigration system, leaders of both organizations said on Monday. The accord could give President Obama significant support among unions as he revisits the stormy issue in the midst of the recession.
The accord
endorses legalizing the status of illegal immigrants already in the United States and opposes any large new program for employers to bring in temporary immigrant workers, officials of both federations said."